I'd be very surprised if the GNOME Foundation passed along *all* funds
untouched donated with a simple earmark for the GIMP to the GIMP people;
I would fully expect them to take an "administrative fee" of between 5%
and 50% (maybe even more). You might want to have an agreement in
writing on this point before you start using them to fundraise.

Dave neary and I talked to Tim Ney about this. There is goign to be a
small cut taken by TGF. It is very close to the lower end of your
range, but I won't know specifically until the board approves the number
(which they are supposed to do soon).